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NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | STANDARDS | HISTORY | SEE ALSO | COLOPHON |
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pciconfig_read(2) System Calls Manual pciconfig_read(2)
pciconfig_read, pciconfig_write, pciconfig_iobase - pci device
information handling
Standard C library (libc, -lc)
#include <pci.h>
int pciconfig_read(unsigned long bus, unsigned long dfn,
unsigned long off, unsigned long size,
unsigned char *buf);
int pciconfig_write(unsigned long bus, unsigned long dfn,
unsigned long off, unsigned long size,
unsigned char *buf);
int pciconfig_iobase(int which, unsigned long bus,
unsigned long devfn);
Most of the interaction with PCI devices is already handled by the
kernel PCI layer, and thus these calls should not normally need to
be accessed from user space.
pciconfig_read()
Reads to buf from device dev at offset off value.
pciconfig_write()
Writes from buf to device dev at offset off value.
pciconfig_iobase()
You pass it a bus/devfn pair and get a physical address for
either the memory offset (for things like prep, this is
0xc0000000), the IO base for PIO cycles, or the ISA holes
if any.
pciconfig_read()
On success, zero is returned. On error, -1 is returned and
errno is set to indicate the error.
pciconfig_write()
On success, zero is returned. On error, -1 is returned and
errno is set to indicate the error.
pciconfig_iobase()
Returns information on locations of various I/O regions in
physical memory according to the which value. Values for
which are: IOBASE_BRIDGE_NUMBER, IOBASE_MEMORY, IOBASE_IO,
IOBASE_ISA_IO, IOBASE_ISA_MEM.
EINVAL size value is invalid. This does not apply to
pciconfig_iobase().
EIO I/O error.
ENODEV For pciconfig_iobase(), "hose" value is NULL. For the
other calls, could not find a slot.
ENOSYS The system has not implemented these calls (CONFIG_PCI not
defined).
EOPNOTSUPP
This return value is valid only for pciconfig_iobase(). It
is returned if the value for which is invalid.
EPERM User does not have the CAP_SYS_ADMIN capability. This does
not apply to pciconfig_iobase().
Linux.
Linux 2.0.26/2.1.11.
capabilities(7)
This page is part of the man-pages (Linux kernel and C library
user-space interface documentation) project. Information about
the project can be found at
⟨https://www.kernel.org/doc/man-pages/⟩. If you have a bug report
for this manual page, see
⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.
This page was obtained from the tarball man-pages-6.15.tar.gz
fetched from
⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on
2025-08-11. If you discover any rendering problems in this HTML
version of the page, or you believe there is a better or more up-
to-date source for the page, or you have corrections or
improvements to the information in this COLOPHON (which is not
part of the original manual page), send a mail to
man-pages@man7.org
Linux man-pages 6.15 2025-05-17 pciconfig_read(2)
Pages that refer to this page: syscalls(2)
Copyright and license for this manual page
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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